Seamless steel pipe has hollow section, which is widely used as pipeline for conveying fluids, such as oil, natural gas, gas, water and some solid materials. Compared with round steel bar, seamless steel pipe is lighter in weight when it has the same torsional strength, and is an economical section steel.

It is widely used in manufacturing structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction. It can improve material utilization, simplify manufacturing process, save material and processing time. Steel pipe has been widely used in manufacturing.

(1) The main production processes of hot-rolled seamless steel tubes:

Tube billet preparation and inspection → tube billet heating → perforation → rolling → reheating → sizing → heat treatment → straightening → finishing → inspection → storage.

(2) The main production processes of cold rolled (drawn) seamless steel tubes:

Tube billet preparation → pickling lubrication → cold rolling (drawn) → heat treatment → straightening → finishing → inspection → storage.